The 27-year-old was sentenced to two years in jail less a day after pleading guilty in an Ontario Court of Justice in St. Catharines to a charge of exercising control over the movements of a person for the purpose of exploitation.
Slawter was also placed on probation for two years and has been added to the national sex offender registry.
Court was told Slawter controlled every aspect of the girl's life, including what she wore and when she could contact with her family.
"The accused controlled every aspect of her life," assistant Crown attorney Andrew Brown told Judge David Harris.
The girl met Slawter in December 2011 through a mutual acquaintance. He pursued the girl and began to discuss his involvement in the sex industry.
Initially, the girl showed no interest in participating in the clandestine sex trade, court was told, so Slawter threatened to kill the victim and her family.
Between December 2011 and April 2012, he forced the girl to work as a prostitute at various motels, hotels and private residences in Niagara Falls.
"Once the customer left the room the accused would enter the room and hold out his empty palm and this was the victim's opportunity to turn over all the money that she had made," Brown said.
The victim estimates she handed over $5,000 to Slawter over the four-month period.
Slawter maintained he thought the girl was 18.
Also in court, Slawter pleaded guilty to two counts of assault in connection with an incident that occurred in May 2013 at the Niagara Detention Centre.
Slawter, an inmate at the Thorold facility at the time, punched a corrections officer in the face and bit the finger of a second officer when the men tried to subdue him.
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